Process for manufacture of low density polytetrofluoroethylene i

Details Process for manufacture of low density polytetrofluoroethylene i Process for manufacture of low density polytetrofluoroethylene i

1990-02-12

1991-03-12

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264174, 2642888, 425113, B29C 4702

Patent

active

049991469

ABSTRACT:
An improved process for manufacturing low density polytetrofluoroethylene insulated cable using a paste type extrudate to form a hollow tube of insulated material extruded about a wire conductor which passes through the extrusion die. As contrasted with earlier methods, the shaped extrudate paste is stretched before removing the extrusion aid substantially at ambient temperature with only residual heat imparted by extrusion by a driven pulley, the peripheral speed of which may be varied in accordance with the speed of the extrudate. With the completion of the stretching, the increased outer surface and porosity of the extrudate permits faster removal of the extrusion aid immediately prior to entering a sintering oven.

REFERENCES:
patent: 2834054 (1958-05-01), Maddock et al.
patent: 2938234 (1960-05-01), Slade
patent: 2945265 (1960-07-01), Sell, Jr. et al.
patent: 3008187 (1961-11-01), Slade
patent: 3260774 (1966-07-01), Harlow
patent: 4225547 (1980-09-01), Okita
patent: 4250138 (1981-02-01), Okita
patent: 4529564 (1985-07-01), Harlow
patent: 4826725 (1989-05-01), Harlow

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